Author
Freedonia Group Incorporated
2
Natural Areas Association (U.S.)
2
Baumgartner, B.
1
Fernald, Merritt Lyndon, 1873-1950
1
Geological Survey (U.S.)
1
Geological Survey of Canada
1
Gray, Asa, 1810-1888
1
Kostylev, V.E.
1
Mundy, E. J.
1
National Earthquake Information Center
1
Pickrill, R.A.
1
Robinson, Benjamin Lincoln, 1864-1935
Society of American Foresters
1
The Geological Society of America
1
Todd, B. J.
1
U.S. Forest Service. Northern Research Station
1
Valentine, P.C.
1